linux-kernel - Re: [PATCH] platform/x86: fujitsu-laptop: rework logolamp

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Date:   Fri, 6 Jan 2017 00:38:01 +1030
From:   Jonathan Woithe <jwoithe@...t42.net>
To:     Micha?? K??pie?? <kernel@...pniu.pl>
Cc:     Darren Hart <dvhart@...radead.org>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] platform/x86: fujitsu-laptop: rework logolamp_set() to
 properly handle errors

On Thu, Jan 05, 2017 at 02:11:29PM +0100, Micha?? K??pie?? wrote:
> Potential errors returned by some call_fext_func() calls inside
> logolamp_set() are currently ignored.  Rework logolamp_set() to properly
> handle them.  This causes one more call_fext_func() call to be made in
> the LED_OFF case, though one could argue that this is logically the
> right thing to do (even though the extra call is not needed to shut the
> LED off).
> 
> Signed-off-by: Micha?? K??pie?? <kernel@...pniu.pl>

Acked-by: Jonathan Woithe <jwoithe@...t42.net>

> ---
> This is a follow-up to a recent patch, "platform/x86: fujitsu-laptop:
> use brightness_set_blocking for LED-setting callbacks" and thus needs
> the latter to be applied first (currently it is already applied in
> testing).
>     
> Instead of sticking "if (ret < 0) return ret;" in two branches I decided
> to restructure logolamp_set() for improved clarity and also to make it
> resemble logolamp_get() a bit more.
> 
>  drivers/platform/x86/fujitsu-laptop.c | 20 ++++++++++++--------
>  1 file changed, 12 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/platform/x86/fujitsu-laptop.c b/drivers/platform/x86/fujitsu-laptop.c
> index b725a907a91f..12f7a8346dd0 100644
> --- a/drivers/platform/x86/fujitsu-laptop.c
> +++ b/drivers/platform/x86/fujitsu-laptop.c
> @@ -271,15 +271,19 @@ static int call_fext_func(int cmd, int arg0, int arg1, int arg2)
>  static int logolamp_set(struct led_classdev *cdev,
>  			       enum led_brightness brightness)
>  {
> -	if (brightness >= LED_FULL) {
> -		call_fext_func(FUNC_LEDS, 0x1, LOGOLAMP_POWERON, FUNC_LED_ON);
> -		return call_fext_func(FUNC_LEDS, 0x1, LOGOLAMP_ALWAYS, FUNC_LED_ON);
> -	} else if (brightness >= LED_HALF) {
> -		call_fext_func(FUNC_LEDS, 0x1, LOGOLAMP_POWERON, FUNC_LED_ON);
> -		return call_fext_func(FUNC_LEDS, 0x1, LOGOLAMP_ALWAYS, FUNC_LED_OFF);
> -	} else {
> -		return call_fext_func(FUNC_LEDS, 0x1, LOGOLAMP_POWERON, FUNC_LED_OFF);
> +	int ret, poweron = FUNC_LED_OFF, always = FUNC_LED_OFF;
> +
> +	if (brightness >= LED_HALF) {
> +		poweron = FUNC_LED_ON;
> +		if (brightness >= LED_FULL)
> +			always = FUNC_LED_ON;
>  	}
> +
> +	ret = call_fext_func(FUNC_LEDS, 0x1, LOGOLAMP_POWERON, poweron);
> +	if (ret < 0)
> +		return ret;
> +
> +	return call_fext_func(FUNC_LEDS, 0x1, LOGOLAMP_ALWAYS, always);
>  }
>  
>  static int kblamps_set(struct led_classdev *cdev,
> -- 
> 2.11.0